BEN-LEDI. 



splendid, than the falls of Brackland, already no- 

 ticed. 



Along the channel of the same stream, frag- 

 ments of micaceous rocks are to be found with 

 shining particles of quartz, and an intermix- 

 ture of hornblende. Some specimens contain 

 a substance, which resembles sparry iron-stone ; 

 but on such an occurrence of that mineral, 

 we cannot yet pronounce with certainty. In 

 other specimens which have a brecciated appear- 

 ance, and which form the connecting link between 

 the common and porphyritic mica- slate, particles 

 are found of a deep-coloured copper-pyrites, the 

 same in kind with what was formerly confounded 

 with gold by the early observers, There is also 

 a fragment, which I picked up here, though not 

 in situ, and of which, from its geognostic position, 

 the original mass appears to have been a bed in 

 clay- slate. It is pure granular hornblende, with 

 a small portion of quartz, and a little mica and 

 iron pyrites. 



In different places of this formation, veins of 

 lead-ore have been discovered. One of these which 

 I examined, lies about a mile to the south of the 

 rivulet above mentioned, at an elevation of more 

 than iooo feet above the foot of the mountain. 

 Here the direction of the clay-slate is nearly east 

 and west, inclination 50 0 south. The vein is said 

 to have yielded at the rate of 20 s. value of silver, 

 for every cwt. of ore, but was found too small for 

 the expence of working. The lead-glance is ac= 



